Article
Thermodynamics
J. C. Umavathi, O. Anwar Beg
Summary: The study investigates fully developed convection in a rectangular duct with porous medium and fluid layer using the Darcy-Brinkman-Forchheimer flow model. Numerical solutions are obtained by solving non-dimensional momentum and energy conservation equations. The study provides insights into the impact of porous structure and immiscible fluids on controlling the flow and presents graphical results and tabular data for various governing parameters.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2021)
Article
Thermodynamics
B. Shruti, Md. Mahbub Alam, A. Parkash, S. Dhinakaran
Summary: In this study, the combined impact of Darcy and Rayleigh number changes on natural convection around two vertically arranged hot porous cylinders of different diameters in a square enclosure is numerically evaluated. The numerical simulations are conducted using the lattice Boltzmann technique and the D2Q9 model. It is found that heat transfer rates improve with an increase in cylinder size, Ra, and Da.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Mohammad Shamsoddini Lori
Summary: This study investigates the impact of using a layer of porous medium in a three-dimensional microchannel on heat transfer and fluid flow characteristics. The results show that the presence of the porous layer improves hydraulic and thermal performance, with increased pressure drop and Nusselt number.
SADHANA-ACADEMY PROCEEDINGS IN ENGINEERING SCIENCES
(2022)
Article
Physics, Multidisciplinary
Mohammad Derikvand, Armin Emamifar
Summary: This study investigates the impacts of adding aluminum foam and slip velocity on natural convection in a square mini-cavity using a numerical method. Changing parameters such as Rayleigh number, slip factor, and Darcy number are studied to analyze the effects on streamlines, isotherms, and Nusselt number. Increasing Ra number improves fluid mixing and vortex size, leading to enhanced Nu number. Slip velocity affects boundary layer and temperature distribution, increasing the convection portion by around 57% in the best case. The presence of metal foam has varied outcomes depending on Ra and Da numbers, with higher permeability showing better improvement in Nu number. Adding metal foam with Da = 0.1 and slip velocity increases Nu number by approximately 130%, but in the absence of slip velocity, Nu number decreases by around 6% at Da = 0.0001. The permeability of porous media is critical in natural convection.
Article
Construction & Building Technology
A. M. Zidan, M. K. Nayak, Nader Karimi, A. Sattar Dogonchi, Ali J. Chamkha, Mohamed Bechir Ben Hamida, Ahmed M. Galal
Summary: This study examines the storage of solar energy using phase change materials in a porous cavity with hot corrugated baffles. The results show that factors such as Rayleigh number, porosity, Darcy number, NEPCM particle volume fraction, length of baffles, and fusion temperature have an impact on heat transfer features and flow patterns.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Energy & Fuels
Kashif Irshad, Amjad Ali Pasha, Mohammed K. Al Mesfer, Mohd Danish, M. K. Nayak, Ali J. Chamkha, Ahmed M. Galal
Summary: The hydrothermal behavior and entropy analysis of double-diffusive Nano-Encapsulated phase change materials (NEPCMs) in a porous H-shaped wavy cavity were investigated in this study. The introduction of a Forchheimer-Brinkman expanded Darcy medium, consisting of NEPCMs and base fluid, in an H-shaped cavity with wavy-shaped walls was the novel aspect of this research. Various parameters, including Ra, & theta;f, N, Da, & epsilon;, and Le, were considered to evaluate their effects on hydrothermal behaviors and the Nusselt and Sherwood numbers. The results showed that Ra and N had a positive influence on convective heat and mass transfer, while Da and Le had a negative impact. Furthermore, the phase change area slightly increased with higher Ra and buoyancy ratio, and & theta;f had a positive influence on convective heat transfer but a negative impact on convective mass transfer.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Thermodynamics
Govindarao Nammi, Dhrijit Kumar Deka, Sukumar Pati, Laszlo Baranyi
Summary: This study investigates unsteady natural convection heat transfer within a square-shaped porous confinement with four heated cylinders, showing different heat transfer phenomena under different Darcy numbers and Rayleigh numbers. As the Rayleigh number increases, the temperature and flow fields in the enclosure lose symmetry under certain conditions.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Engineering, Aerospace
J. C. Umavathi
Summary: This article investigates the triple diffusion effect in a vertical conduit encapsulated with porous matrix and subjected to third kind boundary conditions. The numerical solutions were compared with analytical solutions, showing increasing discrepancy as the Brinkman number expands. The conclusions are applicable to materials processing and chemical transport phenomena.
PROPULSION AND POWER RESEARCH
(2021)
Review
Chemistry, Multidisciplinary
Hossam A. Nabwey, Taher Armaghani, Behzad Azizimehr, Ahmed M. Rashad, Ali J. Chamkha
Summary: This paper presents a review of recent advances in the application of nanofluids in heat transfer in porous materials. The top papers published between 2018 and 2020 were scrutinized to provide valuable insights. Various analytical methods used to describe flow and heat transfer in porous media were thoroughly reviewed, as well as the models used to simulate nanofluids. The reviewed research focused on natural convection, forced convection, and mixed convection heat transfer of nanofluids in porous media. Statistical analysis revealed important findings regarding the impact of parameters such as nanofluid type and flow domain geometry. Furthermore, the paper highlighted the most commonly studied nanofluid and geometry.
Article
Thermodynamics
Umer Farooq, Muzamil Hussain, Muhammad Ahsan Ijaz, Waseem Asghar Khan, Fozia Bashir Farooq
Summary: In the study of boundary layer regions, dimensionless numbers are used to reduce variables and analyze the differences between similar and non-similar flows, as well as the flow across porous media in biological and environmental systems. The Darcy-Forchheimer-Brinkman model is utilized to explore the impact of various parameters on velocity, temperature, and concentration distributions in the flow. The non-similar solutions are compared with local similar solutions for validation.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Engineering, Multidisciplinary
M. Ijaz Khan, Sumaira Qayyum, Faisal Shah, R. Naveen Kumar, R. J. Punith Gowda, B. C. Prasannakumara, Yu-Ming Chu, S. Kadry
Summary: This study investigates the characteristics of hybrid nanofluids, including Marangoni convection, entropy generation, velocity, concentration, temperature, etc., under different influencing factors through calculations and graphical analysis.
AIN SHAMS ENGINEERING JOURNAL
(2021)
Article
Physics, Multidisciplinary
T. N. Sakshath, C. Hemanth Kumar
Summary: An analytic study conducted on Darcy-Benard convection in a Newtonian liquid-saturated porous medium, with the presence of pressure gradient and heat source, using the local thermal non-equilibrium model (LTNE). The LTNE assumption accelerates the onset of convection and enhances heat transport. The increase in the porosity-modified ratio of thermal conductivity and heat source promotes the onset of convection and increases heat transport, while the remaining parameters show an opposite trend. The LTNE effect ceases at a certain point, and the Darcy-Benard convection results using the LTE model are obtained as a limiting case.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Engineering, Multidisciplinary
M. Sankar, H. A. Kumara Swamy, Qasem Al-Mdallal, Abderrahim Wakif
Summary: In the design of thermal devices, the challenge lies in minimizing entropy production while maximizing energy dissipation to enhance system efficiency. This study investigates the combined impacts of source-sink arrangements and annular inclination on buoyant nanoliquid motion, thermal dissipation, and irreversibility distribution in a tilted porous annulus. The findings show that the inclination angle and position of source-sink arrangement play a vital role in fluidity and flow patterns of nanoliquid, leading to higher thermal dissipation and minimum entropy production in thermally efficient systems. The shape of nanoparticles also affects thermal efficiency, with blade-shaped nanoparticles showing better performance. These findings have applications in solar systems, electronic equipment cooling, and heat exchangers.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Thermodynamics
Umair Khan, Aurang Zaib, Sakhinah Abu Bakar, Nepal Chandra Roy, Anuar Ishak
Summary: This study investigates mixed convection of a thermo micropolar hybrid nanofluid through a vertical surface in a saturated porous medium, considering inertial and microstructure characteristics. It distinguishes the effects of two distinct nanoparticles, MgO and Ag, in enhancing heat transfer rates and thermal performance. By transforming the leading equations into ordinary differential equations using similarity transformations, unique outcomes are obtained for buoyancy aiding flow, while dual or multiple outcomes exist for buoyancy opposing flow.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
D. Charreh, Shams-ul Islam, M. Saleem
Summary: This study investigates transient natural convection in a saturated non-Darcy porous medium, examining fluid flows, heat transfer, and entropy generation. The governing equations for fluid flows and heat transfer are solved using the alternate direct implicit method. The results show that the top right wall and base of the heated wall produce the most entropy, and increasing Forschheimer resistance reduces flow rate, heat transfer, and entropy production.
RESULTS IN PHYSICS
(2023)
Article
Thermodynamics
Prasanth Anand Kumar Lam, K. Arul Prakash
ENERGY CONVERSION AND MANAGEMENT
(2016)
Article
Mechanics
I. Paul, K. Arul Prakash, S. Vengadesan, V. Pulletikurthi
JOURNAL OF FLUID MECHANICS
(2016)
Article
Thermodynamics
Sai Rajesh Mahapatro, Karaiyan Arul Prakash
HEAT TRANSFER ENGINEERING
(2018)
Article
Thermodynamics
Siva Sai Vadri, Arul Prakash Karaiyan, Arvind Pattamatta
HEAT TRANSFER ENGINEERING
(2018)
Article
Thermodynamics
Prasanth Anand Kumar Lam, K. Arul Prakash
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2017)
Article
Thermodynamics
P. A. Fuaad, K. Arul Prakash
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2017)
Article
Engineering, Mechanical
Sandeep N. Naik, S. Vengadesan, K. Arul Prakash
JOURNAL OF FLUIDS AND STRUCTURES
(2017)
Article
Engineering, Marine
S. Soumya, K. Arul Prakash
Article
Thermodynamics
Prasanth Anand Kumar Lam, K. Arul Prakash
JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS
(2017)
Article
Computer Science, Interdisciplinary Applications
P. A. Fuaad, K. Arul Prakash
COMPUTERS & FLUIDS
(2019)
Article
Polymer Science
Jipson Johnson, Mohammed Muzwar, Surya Ramakrishnan, Raghuram Chetty, Arul Prakash Karaiyan
Summary: Air filtration is crucial for the performance of engines, particularly in desert environments. Coating cellulose media with nylon-66 nanofibers can enhance filtration efficiency, although it increases pressure drop. This study demonstrates that electrospun nylon-66 nanofiber-coated air filters have higher Q-factor than cellulose media, making them a potential alternative.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Engineering, Multidisciplinary
B. Gopalakrishnan, K. Arul Prakash
INTERNATIONAL JOURNAL OF ADVANCES IN ENGINEERING SCIENCES AND APPLIED MATHEMATICS
(2019)
Article
Engineering, Multidisciplinary
Supratim Saha, T. Purushotham, K. Arul Prakash
INTERNATIONAL JOURNAL OF ADVANCES IN ENGINEERING SCIENCES AND APPLIED MATHEMATICS
(2019)
Proceedings Paper
Mechanics
Sunakraneni Soumya, K. Arul Prakash
FIFTEENTH ASIAN CONGRESS OF FLUID MECHANICS (15ACFM)
(2017)
Proceedings Paper
Energy & Fuels
Harshal Kaushik, Ranjith Mohan, K. Arul Prakash
5TH INTERNATIONAL CONFERENCE ON ADVANCES IN ENERGY RESEARCH (ICAER) 2015
(2016)
Article
Thermodynamics
Mahsa Taghavi, Swapnil Sharma, Vemuri Balakotaiah
Summary: This study investigates the natural convection effects in the insulation layers of spherical storage tanks and their impact on the tanks' performance. The permeability and Rayleigh number of the insulation material are considered as key factors. The results show that as the Rayleigh number increases, new convective cells emerge and cause the cold boundary to approach the external hot boundary. In the case of large temperature differences, multiple solutions may coexist.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinyang Xu, Fangjun Hong, Chaoyang Zhang
Summary: This study introduces a self-induced jet impingement device for enhancing pool boiling performance in high power electronic cooling. Through visualization and parametric investigations, the effects of this device on pool boiling performance are studied, revealing the promotion of additional liquid supply and vapor exhausting. The flow rate of the liquid jet is found to positively impact boiling performance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Wenchao Ke, Yuan Liu, Fissha Biruke Teshome, Zhi Zeng
Summary: Underwater wet laser welding (UWLW) is a promising and labor-saving repair technique. A thermal multi-phase flow model was developed to study the heat transfer, fluid dynamics, and phase transitions during UWLW. The results show that UWLW creates a water keyhole, making the welding environment similar to in air laser welding.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Xingrong Lian, Lin Tian, Zengyao Li, Xinpeng Zhao
Summary: This study investigates the heat transfer mechanisms in natural fiber-derived porous structures and finds that thermal radiation has a significant impact on the thermal conductivity in low-density regions, while natural convection rarely occurs. Insulation materials derived from micron-sized natural fibers can achieve minimum thermal conductivity at specific densities. Strategies to lower the thermal conductivity include increasing porosity and incorporating nanoscale pores using nanosize fibers.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Yasir A. Malik, Kilian Koebschall, Stephan Bansmer, Cameron Tropea, Jeanette Hussong, Philippe Villedieu
Summary: Ice crystal icing is a significant hazard in aviation, and accurate modeling of sticking efficiency is essential. In this study, icing wind tunnel experiments were conducted to quantify the volumetric liquid water fraction, sticking efficiency, and maximum thickness of ice layers. Two measurement techniques, calorimetry and capacitive measurements, were used to measure the liquid water content and distribution in the ice layers. The experiments showed that increasing wet bulb temperatures and substrate heat flux significantly increased sticking efficiency and maximum ice layer thickness.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinqi Hu, Tongtong Geng, Kun Wang, Yuanhong Fan, Chunhua Min, Hsien Chin Su
Summary: This study experimentally examined the heat dissipation of vibrating fans and demonstrated its inherent mechanism through numerical simulation. The results showed that the flow fields induced by the vibrating blades exhibited pulsating features and formed large-scale and small-scale vortical structures, significantly improving heat dissipation. The study also identified the impacts of different blade structures and developed a trapezoidal-folding blade, which effectively reduced the maximum temperature of the heat source and alleviated high-temperature failure crisis.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Dan-Dan Su, Xiao-Bin Li, Hong-Na Zhang, Feng-Chen Li
Summary: The boiling heat transfer of low-boiling-point working fluid is a common heat dissipation technology in electronic equipment cooling. This study analyzed the interfacial boiling behavior of R134a under different conditions and found that factors such as the initial thickness of the liquid film, solid-liquid interaction force, and initial temperature significantly affect the boiling mode and thermal resistance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinyi Wu, Dongke Sun, Wei Chen, Zhenhua Chai
Summary: A unified lattice Boltzmann-phase field scheme is proposed to simulate dendrite growth of binary alloys in the presence of melt convection. The effects of various factors on the growth are investigated numerically, and the model is validated through comparisons and examinations.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Shaokun Ge, Ya Ni, Fubao Zhou, Wangzhaonan Shen, Jia Li, Fengqi Guo, Bobo Shi
Summary: This study investigated the temperature distribution of main cables in a suspension bridge during fire scenarios and proposed a prediction model for the maximum temperature of cables in different lane fires. The results showed that vehicle fires in the emergency lane posed a greater thermal threat to the cables.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Shuang-Ying Wu, Shi-Yao Zhou, Lan Xiao, Jia Luo
Summary: This paper investigates the two-phase flow and heat transfer characteristics of low-velocity jet impacting on a cylindrical surface. The study reveals that the heat transfer regimes are non-phase transition and nucleate boiling with the increase of heat transfer rate. The effects of jet impact height and outlet velocity on local surface temperatures are pronounced at the non-phase transition stage. The growth rates of heat transfer rate and liquid loss rate increase significantly from the non-phase transition to nucleate boiling stage.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Emad Hasani Malekshah, Wlodzimierz Wlodzimierz, Miros law Majkut
Summary: Cavitation has significant practical importance and can be controlled by air injection. This study investigates the natural to ventilated cavitation process around a hydrofoil through numerical and experimental methods. The results show that the location and rate of air injection have a meaningful impact on the characteristics of cavitation.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Feriel Yahiat, Pascale Bouvier, Antoine Beauvillier, Serge Russeil, Christophe Andre, Daniel Bougeard
Summary: This study explores the enhancement of mixing performance in laminar flow equipment by investigating the generation of chaotic advection using wall deformations in annular geometries. The findings demonstrate that the combined geometry can achieve perfect mixing at various Reynolds numbers.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Hui He, Ning Lyu, Caihua Liang, Feng Wang, Xiaosong Zhang
Summary: This study investigates the condensation, frosting, and defrosting processes on superhydrophobic surfaces with millimeter-scale structures. The results reveal that the structures can influence the growth and removal of frost crystals, with the bottom grooves creating a frost-free zone and conical edges promoting higher frost crystal heights. Two effective methods for defrosting are observed: hand-lifting the groove and airfoil retraction contraction on protruding structures. This research provides valuable insights into frost formation and defrosting on millimeter-structured superhydrophobic surfaces, with potential applications in anti-frost engineering.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Thiwanka Arepolage, Christophe Verdy, Thibaut Sylvestre, Aymeric Leray, Sebastien Euphrasie
Summary: This study developed two thermal concentrators, one with a 2D design of uniform thickness and another with a 3D design, using the coordinate transformation technique and metamaterials. By structuring the thermal conductor, the desired local density-heat capacity product and anisotropic thermal conductivities were achieved. The homogenized thermal conductivities were obtained from finite element simulations and cylindrical symmetry consideration. A 3D concentrator was fabricated using 3D metal printing and characterized using a thermal camera. Compared to devices that solely consider anisotropic conductivities, the time evolution characteristics of the metadevice designed with coordinate transformation were closer to those of an ideal concentrator.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Liangyuan Cheng, Qingyang Wang, Jinliang Xu
Summary: In this study, we investigated the supercritical heat transfer of CO2 in a horizontal tube with a diameter of 10.0 mm, covering a wide range of pressures, mass fluxes, and heat fluxes. The study revealed a non-monotonic increase in wall temperatures along the flow direction and observed both positive and negative wall temperature differences between the bottom and top tube. The findings were explained by the thermal conduction in the solid wall interacting with the stratified-wavy flow in the tube.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
